Coaster brake for bicycles



Feb. 12, 1935. F. WINKLER COASTER BRAKE FOR BICYCLES Filed Dec. 17, 1932 Fig. 1.

Inventar UNITED STATES PATENT OFFICE COASTER BRAKE FOR. BICYCLES Franz Winkler, Schweinfui-t, Germany Application December 17, 1932, Serial No.-64.7,702 In Germany December 21, 1931 3 Claims. (01. 192-0.

The, invention relates to coaster-brakes in free 13 and 14 are made for instance of steel while the wheel hubs for bicycles and more particularly loose intermediate discs 15 may consist of brass, to disc brakes comprising discs or plates alterbronze oranother metal or alloy used for braknately engaging with an immovable body and ing. The arrangement may also be provided in with the rotating hub casing, the entire set of .another manner e. g. the three sets of discs may 5 discs or plates being pressed against one another be made of different material each. The discs in a known way by a shiftable member of the 13 by radial projections 16 engage with longifree wheel mechanism when the brake is to be tudinal grooves 17 (Fig. 2) extending over the. operated. whole length. of the bore of the hub shell 3. On The novel feature of the device consists in the the extension 12, which is e. g. of square section, 10 arrangement of additional discs or plates in-, the discs 14 are mounted with the corresponding serted between each rotating and immovable square hole, but also other known means may be disc respectively of the brake, the additional used for' non-rotatably mounting the said discs discs being loose with respect to both adjacent upon said extension. The discs are however 15 brake discs so that friction will be distributed rotatable with respect to both the discs 13 and is over the various contacting surfaces. 14. vThe one end of the set of discs 1315 bears Another object of the invention is to make the against a shoulder 18 of the member 5 and can loose discs which are co-axialty guided between be compressed'by a member 19 adaptedto operthe co-operating discs upon the immovable body, ate against the other end of the said set of discs 20 of difierent metals or alloys to provide for a when it is displaced towards the brake-but is not 20 smooth operation and to prevent seizing. of the capable of turning about the extension 12. brake. A coupling sleeve 20 screwable on the drive 8 In the accompanying drawing, which forms a 'will be displaced in one direction or in the other part of this specification an embodiment of the according to the rotation of the driver. In the invention is illustrated. In the drawing driving operation the coupling sleeve 20 is con- 2d Fig. 1 is a longitudinal sectional view and a nected to the hub shell 3 but in the braking side view of a free wheel hub with a coasteroperation it is displaced in the contrary direction brake comprising the invention; and bears against the operating member 19 under Fig. 2 shows a cross section on the line II--II the action of a known friction spring 21 so as of Fig. l; to shift the said member 19 towards the braking' 80 Fig. 3 is a lateral elevation of a brake dis discs, adapted to engage the hub casing; 1 The loose intermediate discs 15' prevent the Fig. 4 is a lateral elevation of a brake disc havbrake from seizing; moreover the brake is caused ing means for engaging an immovable body of to start smoothly by the fact that these discs the coasterbrake; and adjust themselves in accordance with the condi- 35 Fig. 5 is a lateral elevation of an intermediate 'tions of friction. The intermediate discs 15 may disc according to the invention. idle with the internaldiscs 12 or revolve with, the Like numerals designate like parts throughout external ones 13 but it is also possible that they all figures of the drawing. revolve in respect to either set of discs so that 40 The hub shell 3 of the free wheel hub with braking is rendered more uniform.

coaster-brake is mounted, on the one hand, by What I claim is I means of a ball bearing 4 on a bearing cone 5 1. In combination with a bicycle hub having a secured to the axle 5 and, on the other hand, by rotatable hub shell, a coaster b'rake in the inmeans of a ball bearing 7 on the driver 8 which terior of said hub shell, and including a set of in turn is rotatably mounted on the axle by metal discs rotatable with said hub shell, a set 4 means of a ball bearing 9 and a bearing cone 10. of metal discs held against rotation and ,posi- Between the hub shell 3 and the cone 5, which tioned alternately with said rotatable discs, a can rigidly be connected to the cycle frame as set of intermediatemetal discs each being disusual by a brake arm 11, there is arranged a disc posed between a rotatable disc and a non-rotata- 0 brake to which purpose the inner end of the ble disc for direct engagement therewith and W said cone is lengthened by an extension 12. The loosely mounted for rotation with respect to said brake comprises discs 13 attached to the hub and hub shell, all of said sets of discs having plane discs 14 attached to the extension 12 and loose racing surfaces, and means for pressing all of discs 15 placed between each two discs 13 and 14 said discs together for applying said brake to stop and guided e. g. on the extension 12. The discs further rotation of said hub shell.

2. In combination with a bicycle hub having a rotatable hub shell, a brake for said hub shell and including a set of metal discs connected for rotation with said hub shell, a set of metal nonrotatable discs positioned alternately with respect to said rotatable discs, and a set of discs made of a metal different from that of said rotatable and non-rotatable discs and each disposed between anon-rotatable and rotatable disc for direct engagement therewith, said last mentioned set of discs being loosely mounted for rotation, all of said sets of discs having plane facing surfaces, and means for pressing all of said discs against each other tor braking said hub shell.

3. In a device for use in a bicycle, a fixed axle,

a rotatable hub shell supported on said axle,- a set of metal brake discs having the periphery thereof. interconnected wtih said hub shell so as to be rotatable therewith, a set of metal discs interlocked with said axle against rotation and posi-. tloned alternately with said rotatable discs, a set of loosely mounted metal discs each disposed between a rotatable and a non-rotatable disc for direct engagement therewith, all of said sets of discs having plane facing surfaces, a fixed abutment, an axially shiftable abutment, said abutments being disposed in the interior of said hub shell and confining the discs therebetween, and

-means for shifting the shiftable abutment for pressing all of said discs together into braking position.

FRANZ WINKLER. 

